package HomeWork;
public class HomeWork04 {

	public static void main(String[] args) {
		int jj = 20,a = 0, b = 0;
		for(int ii = 0; ii < jj; ii+=2,jj--){
			if(ii % 3 == 0){
				a = ii;
				System.out.println(ii + " Hello");
			}else{
				b = ii;
				System.out.println(ii + "  World");
			}
			
		}
		
		System.out.println("a*b等于" + "a" + "*" + "b"+ "=" + a*b);

	}

}
